Chalking up another Airsoft GI Christmas Package, the G&G Full Metal GR-16 A3 Carbine, "The new G&G GR-16 A3 Carbine Ver. 3 is everything you could want from your M4 and more. G&G stock externals are of better quality and more aesthetically pleasing that most after market upgrade parts. Th GR-16 A3 features a full metal body and gearbox. One piece metal barrel that is securely fastened to the upper receiver.